手术中突然断电，这位外科医生镇定自若，平静地切换到了备用照明。
The surgeon remained unflappable when the power failed mid-operation, calmly switching to backup lighting.
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解释
unflappable 形容在极端紧急情况下保持冷静镇定。
The surgeon remained unflappable when the power failed mid-operation, calmly switching to backup lighting.
unflappable 形容在极端紧急情况下保持冷静镇定。